Portable power source



FIG. 1 is a front elevational view of a portable power source, showing our new design;

FIG. 2 is a rear elevational view thereof;

FIG. 3 is a left-side elevational view thereof;

FIG. 4 is a right-side elevational view thereof;

FIG. 5 is a top plan view thereof;

FIG. 6 is a bottom plan view thereof;

FIG. 7 is a perspective view thereof; and,

FIG. 8 is another perspective view thereof.

The broken lines in the drawings illustrate portions of the portable power source that form no part of the claimed design. 

CLAIM We claim the ornamental design for a portable power source, as shown and described. 